Aviation Photo #2632989 Sikorsky HRS-1 (S-55B) - USA - Air Force

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The H-19/HRS-1 was the first practical single-rotor utility helicopter and the first in Sikorsky's successful S-55 series. The centre-of-gravity problems of earlier models were solved by shifting the engine to the front and the passenger compartment to beneath the rotor hub. Other innovations included offset-flapping hinges and hydraulically boosted irreversible controls. This example is now on display at the Steven F. Udvar-Hazy Center of the Smithsonian NASM. Ex US Marines 127799.
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    Alastair T. Gardiner
    USA - Air Force
    Sikorsky HRS-1 (S-55B)
    Sikorsky S-55 (H-19/HO4S/HRS/Chickasaw)
    Sikorsky S-55 (H-19/HO4S/HRS/Chickasaw)
    Washington - Dulles International
    April 8, 2015
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Photo Added: May 02, 2015

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